Final answer:
One important legislation passed by George H.W. Bush is the Clean Air Act Amendments of 1990, which targeted acid rain, toxic emissions, and ozone depletion.
Step-by-step explanation:
The correct answer to the question of one important legislation passed by George H.W. Bush is a) The Clean Air Act Amendments. President Bush signed the Clean Air Act Amendments into law in 1990, building upon previous acts to establish new controls for air pollution and introducing regulatory measures designed to deal with acid rain, toxic emissions, and the hole in the ozone layer. The legislation was a substantial contribution to environmental policy, setting the stage for further environmental protection measures in the years to come.